ive been growing a few gsce i use fox farm nutes 4x4 tent two qb 266s for lighting but i just found this yellowing on one of the leaves i have no idea what it could be anyone have any ideas the humidity has been pretty high i turned it down alot. but i have no bugs no fungus nats or anything.
@MattyBear
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I have no clue what that is. Since I’ve joined, no one has posted a picture like that. 
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Could something have been spilled on the leaves?
Looks kinda like a chemical burn
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Water/nutrients got spilled I bet.
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Is it possible that some nutrients or even plain water got spilt on the leaves ? You can check other leaves for white powdery mildew , but I don’t think thats what messed up those leaves . We’ll see what others think .
Plain water will cause the leaves to turn brown.
how high? 80-90% rh? I suspect botrytis if your rh is that high. I’ve seen leaves and bud turn that color brown before (literally over night).
This was taken a few years ago. looks awfully similar to me…
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im pretty sure plain water was spilled on the leave that had it none i checked all of the leaves to make sure there isnt any powdery mildew on any of them ive got three others in there i thought that i might of had something to do with water being on it but i didnt want to take any chances so i clipped the fingers that had it just in case it was mold
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thanks for your help everyone defenitely helps put me at ease a bit i turned the humidifier off now that all the plants are established but that what i thought between the light and having the water on the leave caused it but then i started reading about possible conditions and freaked me out.
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Probably just leaves transpiring on top of one another and then being burned by the lights.
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has anybody tried using one of those hlg flower initiators as of yet and if so did you notice any kind of different results during flowering?